James maetin



(No Model 2 Sheets-Sheet 1. J. MARTIN.

SWING SAW. No. 370,962. Patented Oct. 4, 1887.

ATTORNEYJ.

(No Model.) 2 Sheets-Sheet 2. J. MARTIN.

SWING SAW;

No. 370,962. Patented Oct. 4. 1887.

//V YEN TOR:

ATTORNEYS.

N. PETERS, mumbographor, Wnhinglcn D Q UNITED STATES PATENT OFFICE.

JAMES MARTIN, OF BROOKLYN, NEYV YORK.

SWING-SAW.

SPECIFICATION forming part of Letters Patent No. 370,962, dated ()ctober4, 1887.

Application filed June "I, 1887.

'New York, have invented a new and useful Improvement'in Swing-Saws, ofwhich the following is a full, clear, and exact description.

This invention consists in a swing-saw of novel construction, wherebythe saw is made to cut in a straight lineparallel with the table orcutting surface with facility, if desired, forf changing its directionof cut to a variable angular relation, and so as to cut'at differentdepths, if necessary, substantially as hereinafter described, andpointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification,

in which similar letters of reference indicate corresponding parts inall the figures.

Figure 1 represents a front elevation of a swing-saw machine embodyingmy invention; and Fig. 2 is a vertical section of the same in a plane atright angles to Fig. 1, showing by full and dotted lines the movement ofthe parts, whereby the circular cutter or saw proper is made to travelina straight line parallel with the cutting surface or top of the bed onwhich the material to be cut is designed to rest. Fig. 3 represents sideand end views, respectively, of a special construction of a guide-railattachment on which the swinging frame of the machine rests and travels;and Fig. 4 is a face view of one of a pair of slotted or grooved guidesup and down which the upper portion of the swinging frame moves.

S indicates the cutting-surface or top of the table or bed, on which thetimber to be cut is designed to lie or rest.

K'K are uprights of a main or stationary frame,of any suitableconstruction,and within which the swinging frame A of the machineoscillates or swings.

L is the driving-shaft upon or around which the swinging frame A rocks,and which may be fitted with fast and loose pulleys b a for stopping andstarting it, as desired. Motion is communicated from the shaft L by apulley, d, thereon and endless belt or driver 6 to a pulley, f, upon theshaft of the circular saw J, which has its hearings in the lower ends ofthe swinging frame, while the driving-shaft L occupies a position in theupper portion of said frame, as usual in other swinging saws.

Serial No. 240,525 (No model.)

The swinging frame A, however, is peculiarly supported and operated.Thus it has a free movement up and down at its rocking center of motionby suitable guides-as, for instance, by fitting its trunnions or ends ofthe shaft L on or around which said frame rocks, in boxes 0 0, adaptedto slide up and down within grooved guides B B, secured to the uprightsK K of the main frame. This construction, however, does not support theswinging frame A, but simply provides for its up-and-down movement. Saidframe is supported or rests and travels upon one or more, preferably apair of, stationary guiderails or guide-rail attachments, D, one ofwhich is shown as secured to each upright K at a suitable distance belowthe rocking center of the swinging frame. These guiderail attachments DD, upon which the swinging frame A A rests and travels-as, for instance,by wheels or grooved rollers E, connected with the swinging frame--areof such configuration on their upper or bearing surfaces as will in theswinging of the frame A A cause the saw J to travel in any desired pathother than that in which it would travel were the swinging frame to rockfrom or about a fixed center, instead of a risingandfalling one. Thusthe upper or bearing surfaces of the guide-rails or guiderailattachments D D are shown of such curvilinear shape in direction oftheir length as will conform in a reverse manner to the curvilinearswinging motion of the frame A, so that when said frame is swung forwardfrom the position shown for itby full lines in Fig. 2 to the positionshown for it by dotted lines in the same figure the saw J will travel ina straight line or path parallel with the cutting or table surface S,upon which the timber to be cut rests,

which is at right'angles with a line perpen dicular to it passingthrough the rocking center of the swinging frame. I11 this way thesaw'by a single action is made to cut entirely through the stuff or fullthickness thereof without turning over the wood or stuff and making asecond cut, as necessary when the saw is restricted to move in acurvilinear path due to the rockingof the swinging frame from a fixedcenter. As, however, it sometimes may be necessary to cut in a straightor other line which is not at right-angles to a vertical line or, inother words, will cut in a straight line,

drawn through the rocking center of motion of the swinging frame, or, inother words, has an angular relation to the surface S, I make theguide-rail attachments adjustable to vary the direction of theirbearingsurfaces, as, for instance, by fitting them to turn on pivots. orbolts H in the uprights K K of the main frame upon slackening holding orlocking bolts l, arranged to pass through slots in the guide-railattachments D and uprights K.

The carrying attachments or rollers E on opposite sides of the swingingframe A A are attached to a frame, G, connected with said swingingframe, but adjustable up and down it, as by a hand-screw,F,so that andby suitably adjusting or raising or lowering the guide-rail attachmentsD the swinging frame A and saw J may be made to travel on a higher orlower level, as desired. This will be found convenient in case ofdesiring to cut only partially through the stuff or timber, as fromopposite sides alternately, for instance, to form tenons on the piece ofwood under operation. By arranging the swinging frame A to freely riseand fall in the guides BB at top,and supporting it below by wheels orrollers arranged to run upon the guide-rail attachments D D, a perfectlysteady movement is obtained for said frame and an exceedingly easy one,as there is comparatively no friction. If the table or cutting-surfacebe-out of ahoriZon'tal plane, then still the same relations will beobserved as regards the saw traveling in a path which is out ofconsonance with the curvilinear movement due to the swinging of theframe which carries the saw, nor is it necessary that the guides Bshould be in a vertical position, 7

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In aswing-saw, the combination, with the swinging frame which carriesthe saw and the driving-shaft about which said frame rocks, of guidesand sliding boxes adapted to provide for a free up-and-down movementofsaid shaft, and one or more stationary lower guide-rail attachmentsconstructed to support the swinging frame and to direct it and itsattached saw out of consonance with the curvilinear movement due to theswinging motion of said frame,substantially as specified.

2. The combination of the upper stationary guides, B, the sliding boxes0, having a free upand-down movement, the driving-shaft L, the swingingframe A, with its attached saw J, the guide-rail attachments or devicesD, and the swingingframe carriers or wheels E, essentially as and forthe purpose or purposes herein set forth.

3. The combination, with the verticallyswingingsaw-carrying frameA,havingarising; and-falling center of motion about which said framerocks, of the guide-rail attachments or devices D, made adjustable tovary their angle or level,and the swinging-frame carriers or'wheels E,adapted to run or travel upon said adjustable guide-rail devices,substantially as specified.

4. The combination, with the vertically swingingsaw-earryingframeA,havingarisingand-falling center of motion about which said framerocks, of. the independent frame G, ad-

justable up and down the swinging frame A,the,

wheels, rollers, or carriers E, attached'to said independent frame andserving to support the swinging frame, and the adjustable guide-railattachments or devices D, essentially as described.

JAMES MARTIN.

Witnesses: J

CHARLES H. SMITH, J AMES RITCHIE.

